help me find a proper fan config

I'm getting a cooler master masterbox 600 case along with a 3-pack of 120mm fans mostly for better illumination on top of the included 120mm exhaust and 3x 140mm front fans

the case only has room for an extra 3 120mms at the top and no room for fans at the bottom so id like to know what'd be an ideal config with the items i have, ive already got this in mind but im kinda worried it'd starve the cpu or gpu for fresh air so alternate setups are welcome

im thinking maybe setting the front-most top mounted fan to intake instead of exhaust but i heard having intake right next to exhaust is pretty ineffecient and causes increased wear on the opposing fans

it's also somewhat important that i get a positive pressure setup as i heard it helps keep out dust and i definitely need that with where i live